How about a pushback wall: a bit like the forcefield, but instead of a target point its located around the sentry itself. This way, no melee units can enter the sphere. It wont protect against missiles though. Also - portable shield battery. The sentry can donate a shield to another unit, terran/zerg whatever.
Also chain feed system: sentries can send energy forward by donating it to another sentry. Not like a one-time-donation: but as a continous donation beam.
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How about a pushback wall: a bit like the forcefield, but instead of a target point its located around the sentry itself. This way, no melee units can enter the sphere. It wont protect against missiles though. Also - portable shield battery. The sentry can donate a shield to another unit, terran/zerg whatever.
Also chain feed system: sentries can send energy forward by donating it to another sentry. Not like a one-time-donation: but as a continous donation beam.